Refactor WebCrypto code

content/child/webcrypto/webcrypto_util.h

Index: content/child/webcrypto/webcrypto_util.h
diff --git a/content/child/webcrypto/webcrypto_util.h b/content/child/webcrypto/webcrypto_util.h
index f4a2a6f65287160bb63ab23869a90a5b7b00a537..43aac305d943f0002a10d7aca7604a6c100f08b7 100644
--- a/content/child/webcrypto/webcrypto_util.h
+++ b/content/child/webcrypto/webcrypto_util.h
@@ -67,17 +67,30 @@ CONTENT_EXPORT blink::WebCryptoAlgorithm CreateRsaHashedImportAlgorithm(
     blink::WebCryptoAlgorithmId id,
     blink::WebCryptoAlgorithmId hash_id);
 
-bool CreateSecretKeyAlgorithm(const blink::WebCryptoAlgorithm& algorithm,
-                              unsigned int keylen_bytes,
-                              blink::WebCryptoKeyAlgorithm* key_algorithm);
-
 // Returns true if the set bits in b make up a subset of the set bits in a.
 bool ContainsKeyUsages(blink::WebCryptoKeyUsageMask a,
                        blink::WebCryptoKeyUsageMask b);
 
+bool KeyUsageAllows(const blink::WebCryptoKey& key,
+                    const blink::WebCryptoKeyUsage usage);
+
 bool IsAlgorithmRsa(blink::WebCryptoAlgorithmId alg_id);
 bool IsAlgorithmAsymmetric(blink::WebCryptoAlgorithmId alg_id);
 
+Status GetAesGcmTagLength(const blink::WebCryptoAesGcmParams* params,
+                          unsigned int* tag_length_bits);
+
+Status GetAesKeyGenLength(const blink::WebCryptoAesKeyGenParams* params,
+                          unsigned int* keylen_bits);
+
+Status GetHmacKeyGenLength(const blink::WebCryptoHmacKeyGenParams* params,
+                           unsigned int* keylen_bits);
+
+Status VerifyAesKeyLengthForImport(unsigned int keylen_bytes);
+
+Status CheckKeyCreationUsages(blink::WebCryptoKeyUsageMask all_possible_usages,
+                              blink::WebCryptoKeyUsageMask actual_usages);
+
 }  // namespace webcrypto
 
 }  // namespace content